Search results for “Mole”

Diffusion States of Matter & Gas Laws m²/s The spontaneous spreading of one substance through another as a result of random molecular motion. J = −D (dc/dx)

Dipole Moment Chemical Bonding & Molecular Structure D The vector measure of the separation of positive and negative charge in a bond or molecule. μ = q × d

Dipole–Dipole Interaction Chemical Bonding & Molecular Structure kJ/mol The electrostatic attraction between the positive end of one polar molecule and the negative end of another. E ∝ μ₁μ₂ / r³

Diprotic Acid Acids, Bases & Salts mol/L An acid that can donate two protons per molecule. H₂A ⇌ 2H⁺ + A²⁻

Dynamic Equilibrium Chemical Equilibrium Dimensionless An equilibrium in which opposing processes continue at the molecular level but at equal and opposite rates. rate_forward = rate_reverse

Effusion States of Matter & Gas Laws mol/s The escape of gas molecules one at a time through a hole much smaller than the mean free path. rate ∝ 1 / √M

Electron Affinity Atomic Structure & Periodicity kJ/mol The energy change when one mole of gaseous atoms each gains an electron to form gaseous negative ions. X(g) + e⁻ → X⁻(g)

Enthalpy of Atomisation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of gaseous atoms is produced from an element in its standard state. ΔH_at°

Enthalpy of Fusion Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a solid melts to a liquid at its melting point. ΔH_fus

Enthalpy of Neutralisation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when an acid and a base react to form one mole of water under standard conditions. H⁺ + OH⁻ → H₂O, ΔH = −57.1 kJ

Enthalpy of Solution Solutions & Colligative Properties kJ/mol The heat absorbed or released when one mole of a substance dissolves completely in a large excess of solvent. ΔH_sol = ΔH_lattice + ΔH_hyd

Enthalpy of Sublimation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a solid converts directly into vapour. ΔH_sub = ΔH_fus + ΔH_vap

Enthalpy of Vaporisation Thermochemistry & Thermodynamics kJ/mol The enthalpy change when one mole of a liquid becomes vapour at its boiling point. ΔH_vap

Enzyme Catalysis Chemical Kinetics & Catalysis Dimensionless Catalysis by protein molecules that bind substrates at a specific active site and lower the activation energy dramatically.

Equivalent Weight Stoichiometry & Chemical Reactions g/equiv The mass of a substance that combines with or displaces 1.008 g of hydrogen, 8 g of oxygen or one mole of electrons. E = M / n-factor

Evaporation States of Matter & Gas Laws kJ/mol The escape of molecules from the surface of a liquid into the vapour phase below the boiling point.

Faraday Constant Electrochemistry & Redox C/mol The electric charge carried by one mole of electrons. F = 96,485 C/mol

Fragmentation Pattern Analytical Chemistry & Spectroscopy Da The characteristic set of smaller ions produced when a molecular ion breaks apart in a mass spectrometer.

Functional Group Organic Chemistry Dimensionless An atom or group of atoms within a molecule that determines its characteristic chemical behaviour.

Glycolysis Biochemistry & Polymer Chemistry kJ/mol The ten-step metabolic pathway that converts one molecule of glucose into two of pyruvate. C₆H₁₂O₆ → 2C₃H₄O₃ + 2ATP + 2NADH

Glycosidic Bond Biochemistry & Polymer Chemistry Dimensionless The covalent linkage joining a sugar unit to another molecule through an oxygen bridge. C–O–C

High-Resolution Mass Spectrometry Analytical Chemistry & Spectroscopy Da Mass spectrometry capable of measuring mass to four or more decimal places, allowing molecular formulae to be determined.

HOMO and LUMO Chemical Bonding & Molecular Structure eV The highest occupied and lowest unoccupied molecular orbitals, which together govern a molecule's reactivity and spectroscopy. ΔE = E_LUMO − E_HOMO

Hydrate Foundations of Chemistry Dimensionless A crystalline compound in which a definite number of water molecules is incorporated into the lattice. MX·nH₂O

Results for “Mole”